Perhaps you should try some spelling variations:
trinh thuong » trinh phuong, trinh huong, trinh truong
thuong luan » thuong lan, thong luan, truong luan
minh thang » minh hang, minh trang, dinh thang
thang dung » thong dung, thanh dung, thanh duong
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » kiem soat, bien soan, kien hoa
van kien » van tien, van hien, van chien

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( minh thang dung va ((hieu soat) OR (hieu qua)) ) OR ( trinh thuong luan van kien soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( minh thang dung va ((hieu soat) or (hieu qua)) ) or ( trinh thuong luan van kien soat ))*.